Improvement in cupola-furnaces



P. W MACKENZ|E.

Cupola Furnace.

ETER

Patented Aug. 25, I857.

UNITED STATES PATE T OFFICE.

PHILIP \I MACKENZIE, OE JERSEY CITY, NEW JERSEY.

IMPROVEMENT IN CUPOLA-FURNACES.

Specification forming part of Letters Patent No. 18.05 I dated August25, 1857.

To all whom, it may concern.

Be it known that I, PHILIP W. MACKENZIE, of Jersey City, in the countyof Hudson and State. of New Jersey. have invented or discovered a newand useful Improvement in Cupolas for Melting Iron, which is alsoapplicable to blast-furnaces; and I do hereby declare that the followingis afull, clear, and exact description of the same.

Figure 1 in the annexed drawings, which form a part of thisspecification, is an elevated cut section. Fig. 2 is a horizontal cutsection through the lines Z Z of Fig. 1. Fig. 3 a-horizontal cut sectionthrough the lines Y Y of Fig. 1.

Similar letters of reference indicate corresponding parts of thedifferent figures.

Letters A A A in Fig. 2 represent the elongated form of my cupola. a ato represent the inner face of brick-work. The sides are hererepresented straight, supposing it to be the most economical form; but Ipropose making them curved or straight, as may be most durable.

b b I) in Figs. 1 and 3 represent the mode of entering the blast intothe cupola, as indicated by the arrows, the tuyere-plate c c, whichforms top of tuyere, being removed. The short columns (1 d, offire-brick or any suitable substance, support the tuyere-plate and thebrick-work thereon, but are placed, asindicated, back from the innerface of brickwork, so as not to interfere with or obstruct the blastwhere it enters the fuel at a a, the blast entering the ordinaryair-chamber atjj, passing along the chamber f f, and between the columnsd d d, as indicated by arrows.

G G, Fig. 1', represent the cupola as being enlarged below the upperpart of tuyere h h, thereby increasing its capacity at that point,

and in a great measure reduces the pressure at the tuyere, facilitatingthe blast in getting under the fuel and reaching the center.

B B, Fig. 2, represent my mode of constructing shells of cupolas, asthey are frequently bursting open by the expansion of the brick-work, toobviate which I concave sections of it, as indicated at B B, so that asthe bricks expand the shell is drawn from the brick-work at that point,thereby relieving the strain until the shell has become heated andexpanded also. This novel arrangement is intended to and does reduce thequantity of fuel consumed as compared with those now in use from twentyto forty per cent., melting .much faster and making hotter iron. Thesetration to the center, and making every inch of area activemelting-surface, and is managed or operated the same as an ordinarycupola.

I do not claim the boshing or outside airchamber; but

WVhat I do claim is- Forming a continuous sheet of air, as indicated ata a, where it is brought in contact with the fuel, in combination withthe elongated form and increased size below a a, where the blast entersthe fuel.

PHILIP W. MACKENZIE.

Witnesses:

WM. WARD, J OHN B. DRAYTON.

